« first day (231 days earlier)      last day (2203 days later) » 

5:21 AM
It is probably a byproduct of merging - the answer are not CW although the question is CW: Why worry about commutativity and not associativity in The Fundamental Theorem of Arithmetic? (Under normal circumstances an answer to a CW question is automatically CW.)
7
A: Why on a community wiki question some answers are community wiki and some are not?

Daniel FischerThe question was merged with another one after it was made community wiki. The answers from the merge source were not automatically converted to CW upon the merge, it seems.

7
A: Why on a community wiki question some answers are community wiki and some are not?

quidLeaving the specific question aside: The phenomenon of non-CW or "mixed" answers to CW questions used to be quite common when CW could still be induced by OP (or by edits) of question posts. When they did this after some answers where given, then the existing answers were not made CW.

 
 
3 hours later…

« first day (231 days earlier)      last day (2203 days later) »